Admin: 1 версия

2010-06-01T05:02:08Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Inject DataSource ==

<p>File: EmployeeBean.java</p>



<source lang="java">
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.annotation.Resource;
import javax.ejb.EJBException;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;
@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService") private EntityManager manager;

@Resource(mappedName="java:/DefaultDS") DataSource dataSource;
public void doAction(){
PreparedStatement ps = null;
Connection con = null;
try
{
con = dataSource.getConnection();
System.out.println("Creating table PAYMENT...");
ps = con.prepareStatement("drop TABLE PAYMENT");
ps.execute();
ps = con.prepareStatement("CREATE TABLE PAYMENT ( " +
"CUSTOMER_ID INT, " +
"AMOUNT DECIMAL (8,2), " +
"TYPE CHAR (10), " +
"CHECK_BAR_CODE CHAR (50), " +
"CHECK_NUMBER INTEGER, " +
"CREDIT_NUMBER CHAR (20), " +
"CREDIT_EXP_DATE DATE" +
")");
ps.execute();
System.out.println("...done!");
}
catch (SQLException sql)
{
throw new EJBException(sql);
}
finally
{
try { if (ps != null) ps.close(); } catch (Exception e) {}
try { if (con != null) con.close(); } catch (Exception e) {}
}
Customer cust = new Customer();
cust.setLastName("Bond");
cust.setSsn(1L);
manager.persist(cust);

System.out.println("Saved");

cust = manager.find(Customer.class,1L);
System.out.println(cust.getLastName());

cust.setLastName("new name");

manager.persist(cust);

cust = manager.find(Customer.class,1L);
System.out.println(cust.getLastName());

manager.remove(cust);

}
}</source>



== Use JDBC In EJB ==

<p>File: Customer.java</p>



<source lang="java">
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
@EntityListeners(EntityListener.class)
public class Customer implements java.io.Serializable {
private String firstName;
private String lastName;
@Id
private long ssn;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}

public long getSsn() {
return ssn;
}
public void setSsn(long ssn) {
this.ssn = ssn;
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010